-
Notifications
You must be signed in to change notification settings - Fork 6
/
emacs.c
2165 lines (1958 loc) · 41.8 KB
/
emacs.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* $OpenBSD: emacs.c,v 1.90 2023/06/21 22:22:08 millert Exp $ */
/*
* Emacs-like command line editing and history
*
* created by Ron Natalie at BRL
* modified by Doug Kingston, Doug Gwyn, and Lou Salkind
* adapted to PD ksh by Eric Gisin
*
* partial rewrite by Marco Peereboom <[email protected]>
* under the same license
*/
#include "config.h"
#ifdef EMACS
#include <sys/queue.h>
#include <sys/stat.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef SMALL
# include <term.h>
# include <curses.h>
#endif
#include "sh.h"
#include "edit.h"
static Area aedit;
#define AEDIT &aedit /* area for kill ring and macro defns */
/* values returned by keyboard functions */
#define KSTD 0
#define KEOL 1 /* ^M, ^J */
#define KINTR 2 /* ^G, ^C */
typedef int (*kb_func)(int);
struct x_ftab {
kb_func xf_func;
const char *xf_name;
short xf_flags;
};
#define XF_ARG 1 /* command takes number prefix */
#define XF_NOBIND 2 /* not allowed to bind to function */
#define XF_PREFIX 4 /* function sets prefix */
/* Separator for completion */
#define is_cfs(c) (c == ' ' || c == '\t' || c == '"' || c == '\'')
/* Separator for motion */
#define is_mfs(c) (!(isalnum((unsigned char)c) || \
c == '_' || c == '$' || c & 0x80))
/* Arguments for do_complete()
* 0 = enumerate M-= complete as much as possible and then list
* 1 = complete M-Esc
* 2 = list M-?
*/
typedef enum {
CT_LIST, /* list the possible completions */
CT_COMPLETE, /* complete to longest prefix */
CT_COMPLIST /* complete and then list (if non-exact) */
} Comp_type;
/* keybindings */
struct kb_entry {
TAILQ_ENTRY(kb_entry) entry;
unsigned char *seq;
int len;
struct x_ftab *ftab;
void *args;
};
TAILQ_HEAD(kb_list, kb_entry);
struct kb_list kblist = TAILQ_HEAD_INITIALIZER(kblist);
/* { from 4.9 edit.h */
/*
* The following are used for my horizontal scrolling stuff
*/
static char *xbuf; /* beg input buffer */
static char *xend; /* end input buffer */
static char *xcp; /* current position */
static char *xep; /* current end */
static char *xbp; /* start of visible portion of input buffer */
static char *xlp; /* last byte visible on screen */
static int x_adj_ok;
/*
* we use x_adj_done so that functions can tell
* whether x_adjust() has been called while they are active.
*/
static int x_adj_done;
static int xx_cols;
static int x_col;
static int x_displen;
static int x_arg; /* general purpose arg */
static int x_arg_defaulted;/* x_arg not explicitly set; defaulted to 1 */
static int xlp_valid;
/* end from 4.9 edit.h } */
static int x_tty; /* are we on a tty? */
static int x_bind_quiet; /* be quiet when binding keys */
static int (*x_last_command)(int);
static char **x_histp; /* history position */
static int x_nextcmd; /* for newline-and-next */
static char *xmp; /* mark pointer */
#define KILLSIZE 20
static char *killstack[KILLSIZE];
static int killsp, killtp;
static int x_literal_set;
static int x_arg_set;
static char *macro_args;
static int prompt_skip;
static int prompt_redraw;
static int x_ins(char *);
static void x_delete(int, int);
static int x_bword(void);
static int x_fword(void);
static void x_goto(char *);
static void x_bs(int);
static int x_size_str(char *);
static int x_size(int);
static void x_zots(char *);
static void x_zotc(int);
static void x_load_hist(char **);
static int x_search(char *, int, int);
static int x_match(char *, char *);
static void x_redraw(int);
static void x_push(int);
static void x_adjust(void);
static void x_e_ungetc(int);
static int x_e_getc(void);
static int x_e_getu8(char *, int);
static void x_e_putc(int);
static void x_e_puts(const char *);
static int x_comment(int);
static int x_fold_case(int);
static char *x_lastcp(void);
static void do_complete(int, Comp_type);
static int isu8cont(unsigned char);
/* proto's for keybindings */
static int x_abort(int);
static int x_beg_hist(int);
static int x_clear_screen(int);
static int x_comp_comm(int);
static int x_comp_file(int);
static int x_complete(int);
static int x_del_back(int);
static int x_del_bword(int);
static int x_del_char(int);
static int x_del_fword(int);
static int x_del_line(int);
static int x_draw_line(int);
static int x_end_hist(int);
static int x_end_of_text(int);
static int x_enumerate(int);
static int x_eot_del(int);
static int x_error(int);
static int x_goto_hist(int);
static int x_ins_string(int);
static int x_insert(int);
static int x_kill(int);
static int x_kill_region(int);
static int x_list_comm(int);
static int x_list_file(int);
static int x_literal(int);
static int x_meta_yank(int);
static int x_mv_back(int);
static int x_mv_begin(int);
static int x_mv_bword(int);
static int x_mv_end(int);
static int x_mv_forw(int);
static int x_mv_fword(int);
static int x_newline(int);
static int x_next_com(int);
static int x_nl_next_com(int);
static int x_noop(int);
static int x_prev_com(int);
static int x_prev_histword(int);
static int x_search_char_forw(int);
static int x_search_char_back(int);
static int x_search_hist(int);
static int x_set_mark(int);
static int x_transpose(int);
static int x_xchg_point_mark(int);
static int x_yank(int);
static int x_comp_list(int);
static int x_expand(int);
static int x_fold_capitalize(int);
static int x_fold_lower(int);
static int x_fold_upper(int);
static int x_set_arg(int);
static int x_comment(int);
#ifdef DEBUG
static int x_debug_info(int);
#endif
static const struct x_ftab x_ftab[] = {
{ x_abort, "abort", 0 },
{ x_beg_hist, "beginning-of-history", 0 },
{ x_clear_screen, "clear-screen", 0 },
{ x_comp_comm, "complete-command", 0 },
{ x_comp_file, "complete-file", 0 },
{ x_complete, "complete", 0 },
{ x_del_back, "delete-char-backward", XF_ARG },
{ x_del_bword, "delete-word-backward", XF_ARG },
{ x_del_char, "delete-char-forward", XF_ARG },
{ x_del_fword, "delete-word-forward", XF_ARG },
{ x_del_line, "kill-line", 0 },
{ x_draw_line, "redraw", 0 },
{ x_end_hist, "end-of-history", 0 },
{ x_end_of_text, "eot", 0 },
{ x_enumerate, "list", 0 },
{ x_eot_del, "eot-or-delete", XF_ARG },
{ x_error, "error", 0 },
{ x_goto_hist, "goto-history", XF_ARG },
{ x_ins_string, "macro-string", XF_NOBIND },
{ x_insert, "auto-insert", XF_ARG },
{ x_kill, "kill-to-eol", XF_ARG },
{ x_kill_region, "kill-region", 0 },
{ x_list_comm, "list-command", 0 },
{ x_list_file, "list-file", 0 },
{ x_literal, "quote", 0 },
{ x_meta_yank, "yank-pop", 0 },
{ x_mv_back, "backward-char", XF_ARG },
{ x_mv_begin, "beginning-of-line", 0 },
{ x_mv_bword, "backward-word", XF_ARG },
{ x_mv_end, "end-of-line", 0 },
{ x_mv_forw, "forward-char", XF_ARG },
{ x_mv_fword, "forward-word", XF_ARG },
{ x_newline, "newline", 0 },
{ x_next_com, "down-history", XF_ARG },
{ x_nl_next_com, "newline-and-next", 0 },
{ x_noop, "no-op", 0 },
{ x_prev_com, "up-history", XF_ARG },
{ x_prev_histword, "prev-hist-word", XF_ARG },
{ x_search_char_forw, "search-character-forward", XF_ARG },
{ x_search_char_back, "search-character-backward", XF_ARG },
{ x_search_hist, "search-history", 0 },
{ x_set_mark, "set-mark-command", 0 },
{ x_transpose, "transpose-chars", 0 },
{ x_xchg_point_mark, "exchange-point-and-mark", 0 },
{ x_yank, "yank", 0 },
{ x_comp_list, "complete-list", 0 },
{ x_expand, "expand-file", 0 },
{ x_fold_capitalize, "capitalize-word", XF_ARG },
{ x_fold_lower, "downcase-word", XF_ARG },
{ x_fold_upper, "upcase-word", XF_ARG },
{ x_set_arg, "set-arg", XF_NOBIND },
{ x_comment, "comment", 0 },
{ 0, 0, 0 },
#ifdef DEBUG
{ x_debug_info, "debug-info", 0 },
#else
{ 0, 0, 0 },
#endif
{ 0, 0, 0 },
};
int
isu8cont(unsigned char c)
{
return (c & (0x80 | 0x40)) == 0x80;
}
int
x_emacs(char *buf, size_t len)
{
struct kb_entry *k, *kmatch = NULL;
char line[LINE + 1];
int at = 0, ntries = 0, submatch, ret;
const char *p;
xbp = xbuf = buf; xend = buf + len;
xlp = xcp = xep = buf;
*xcp = 0;
xlp_valid = true;
xmp = NULL;
x_histp = histptr + 1;
xx_cols = x_cols;
x_col = promptlen(prompt, &p);
prompt_skip = p - prompt;
x_adj_ok = 1;
prompt_redraw = 1;
if (x_col > xx_cols)
x_col = x_col - (x_col / xx_cols) * xx_cols;
x_displen = xx_cols - 2 - x_col;
x_adj_done = 0;
pprompt(prompt, 0);
if (x_displen < 1) {
x_col = 0;
x_displen = xx_cols - 2;
x_e_putc('\n');
prompt_redraw = 0;
}
if (x_nextcmd >= 0) {
int off = source->line - x_nextcmd;
if (histptr - history >= off)
x_load_hist(histptr - off);
x_nextcmd = -1;
}
x_literal_set = 0;
x_arg = -1;
x_last_command = NULL;
while (1) {
x_flush();
if ((at = x_e_getu8(line, at)) < 0)
return 0;
ntries++;
if (x_arg == -1) {
x_arg = 1;
x_arg_defaulted = 1;
}
if (x_literal_set) {
/* literal, so insert it */
x_literal_set = 0;
submatch = 0;
} else {
submatch = 0;
kmatch = NULL;
TAILQ_FOREACH(k, &kblist, entry) {
if (at > k->len)
continue;
if (memcmp(k->seq, line, at) == 0) {
/* sub match */
submatch++;
if (k->len == at)
kmatch = k;
}
/* see if we can abort search early */
if (submatch > 1)
break;
}
}
if (submatch == 1 && kmatch) {
if (kmatch->ftab->xf_func == x_ins_string &&
kmatch->args && !macro_args) {
/* treat macro string as input */
macro_args = kmatch->args;
ret = KSTD;
} else
ret = kmatch->ftab->xf_func(line[at - 1]);
} else {
if (submatch)
continue;
if (ntries > 1) {
ret = x_error(0); /* unmatched meta sequence */
} else if (at > 1) {
x_ins(line);
ret = KSTD;
} else {
ret = x_insert(line[0]);
}
}
switch (ret) {
case KSTD:
if (kmatch)
x_last_command = kmatch->ftab->xf_func;
else
x_last_command = NULL;
break;
case KEOL:
ret = xep - xbuf;
return (ret);
break;
case KINTR:
trapsig(SIGINT);
x_mode(false);
unwind(LSHELL);
x_arg = -1;
break;
default:
bi_errorf("invalid return code"); /* can't happen */
}
/* reset meta sequence */
at = ntries = 0;
if (x_arg_set)
x_arg_set = 0; /* reset args next time around */
else
x_arg = -1;
}
}
static int
x_insert(int c)
{
char str[2];
/*
* Should allow tab and control chars.
*/
if (c == 0) {
x_e_putc(BEL);
return KSTD;
}
str[0] = c;
str[1] = '\0';
while (x_arg--)
x_ins(str);
return KSTD;
}
static int
x_ins_string(int c)
{
return x_insert(c);
}
static int
x_do_ins(const char *cp, size_t len)
{
if (xep+len >= xend) {
x_e_putc(BEL);
return -1;
}
memmove(xcp+len, xcp, xep - xcp + 1);
memmove(xcp, cp, len);
xcp += len;
xep += len;
return 0;
}
static int
x_ins(char *s)
{
char *cp = xcp;
int adj = x_adj_done;
if (x_do_ins(s, strlen(s)) < 0)
return -1;
/*
* x_zots() may result in a call to x_adjust()
* we want xcp to reflect the new position.
*/
xlp_valid = false;
x_lastcp();
x_adj_ok = (xcp >= xlp);
x_zots(cp);
if (adj == x_adj_done) { /* has x_adjust() been called? */
/* no */
for (cp = xlp; cp > xcp; )
x_bs(*--cp);
}
x_adj_ok = 1;
return 0;
}
static int
x_del_back(int c)
{
int col = xcp - xbuf;
if (col == 0) {
x_e_putc(BEL);
return KSTD;
}
if (x_arg > col)
x_arg = col;
while (x_arg < col && isu8cont(xcp[-x_arg]))
x_arg++;
x_goto(xcp - x_arg);
x_delete(x_arg, false);
return KSTD;
}
static int
x_del_char(int c)
{
int nleft = xep - xcp;
if (!nleft) {
x_e_putc(BEL);
return KSTD;
}
if (x_arg > nleft)
x_arg = nleft;
while (x_arg < nleft && isu8cont(xcp[x_arg]))
x_arg++;
x_delete(x_arg, false);
return KSTD;
}
/* Delete nc bytes to the right of the cursor (including cursor position) */
static void
x_delete(int nc, int push)
{
int i,j;
char *cp;
if (nc == 0)
return;
if (xmp != NULL && xmp > xcp) {
if (xcp + nc > xmp)
xmp = xcp;
else
xmp -= nc;
}
/*
* This lets us yank a word we have deleted.
*/
if (push)
x_push(nc);
xep -= nc;
cp = xcp;
j = 0;
i = nc;
while (i--) {
j += x_size((unsigned char)*cp++);
}
memmove(xcp, xcp+nc, xep - xcp + 1); /* Copies the null */
x_adj_ok = 0; /* don't redraw */
xlp_valid = false;
x_zots(xcp);
/*
* if we are already filling the line,
* there is no need to ' ','\b'.
* But if we must, make sure we do the minimum.
*/
if ((i = xx_cols - 2 - x_col) > 0) {
j = (j < i) ? j : i;
i = j;
while (i--)
x_e_putc(' ');
i = j;
while (i--)
x_e_putc('\b');
}
/*x_goto(xcp);*/
x_adj_ok = 1;
xlp_valid = false;
for (cp = x_lastcp(); cp > xcp; )
x_bs(*--cp);
return;
}
static int
x_del_bword(int c)
{
x_delete(x_bword(), true);
return KSTD;
}
static int
x_mv_bword(int c)
{
(void)x_bword();
return KSTD;
}
static int
x_mv_fword(int c)
{
x_goto(xcp + x_fword());
return KSTD;
}
static int
x_del_fword(int c)
{
x_delete(x_fword(), true);
return KSTD;
}
static int
x_bword(void)
{
int nc = 0;
char *cp = xcp;
if (cp == xbuf) {
x_e_putc(BEL);
return 0;
}
while (x_arg--) {
while (cp != xbuf && is_mfs(cp[-1])) {
cp--;
nc++;
}
while (cp != xbuf && !is_mfs(cp[-1])) {
cp--;
nc++;
}
}
x_goto(cp);
return nc;
}
static int
x_fword(void)
{
int nc = 0;
char *cp = xcp;
if (cp == xep) {
x_e_putc(BEL);
return 0;
}
while (x_arg--) {
while (cp != xep && is_mfs(*cp)) {
cp++;
nc++;
}
while (cp != xep && !is_mfs(*cp)) {
cp++;
nc++;
}
}
return nc;
}
static void
x_goto(char *cp)
{
if (cp < xbp || cp >= (xbp + x_displen)) {
/* we are heading off screen */
xcp = cp;
x_adjust();
} else if (cp < xcp) { /* move back */
while (cp < xcp)
x_bs((unsigned char)*--xcp);
} else if (cp > xcp) { /* move forward */
while (cp > xcp)
x_zotc((unsigned char)*xcp++);
}
}
static void
x_bs(int c)
{
int i;
i = x_size(c);
while (i--)
x_e_putc('\b');
}
static int
x_size_str(char *cp)
{
int size = 0;
while (*cp)
size += x_size(*cp++);
return size;
}
static int
x_size(int c)
{
if (c=='\t')
return 4; /* Kludge, tabs are always four spaces. */
if (iscntrl(c)) /* control char */
return 2;
if (isu8cont(c))
return 0;
return 1;
}
static void
x_zots(char *str)
{
int adj = x_adj_done;
if (str > xbuf && isu8cont(*str)) {
while (str > xbuf && isu8cont(*str))
str--;
x_e_putc('\b');
}
x_lastcp();
while (*str && str < xlp && adj == x_adj_done)
x_zotc(*str++);
}
static void
x_zotc(int c)
{
if (c == '\t') {
/* Kludge, tabs are always four spaces. */
x_e_puts(" ");
} else if (iscntrl(c)) {
x_e_putc('^');
x_e_putc(UNCTRL(c));
} else
x_e_putc(c);
}
static int
x_mv_back(int c)
{
int col = xcp - xbuf;
if (col == 0) {
x_e_putc(BEL);
return KSTD;
}
if (x_arg > col)
x_arg = col;
while (x_arg < col && isu8cont(xcp[-x_arg]))
x_arg++;
x_goto(xcp - x_arg);
return KSTD;
}
static int
x_mv_forw(int c)
{
int nleft = xep - xcp;
if (!nleft) {
x_e_putc(BEL);
return KSTD;
}
if (x_arg > nleft)
x_arg = nleft;
while (x_arg < nleft && isu8cont(xcp[x_arg]))
x_arg++;
x_goto(xcp + x_arg);
return KSTD;
}
static int
x_search_char_forw(int c)
{
char *cp = xcp;
*xep = '\0';
c = x_e_getc();
while (x_arg--) {
if (c < 0 ||
((cp = (cp == xep) ? NULL : strchr(cp + 1, c)) == NULL &&
(cp = strchr(xbuf, c)) == NULL)) {
x_e_putc(BEL);
return KSTD;
}
}
x_goto(cp);
return KSTD;
}
static int
x_search_char_back(int c)
{
char *cp = xcp, *p;
c = x_e_getc();
for (; x_arg--; cp = p)
for (p = cp; ; ) {
if (p-- == xbuf)
p = xep;
if (c < 0 || p == cp) {
x_e_putc(BEL);
return KSTD;
}
if (*p == c)
break;
}
x_goto(cp);
return KSTD;
}
static int
x_newline(int c)
{
x_e_putc('\r');
x_e_putc('\n');
x_flush();
*xep++ = '\n';
return KEOL;
}
static int
x_end_of_text(int c)
{
x_zotc(edchars.eof);
x_putc('\r');
x_putc('\n');
x_flush();
return KEOL;
}
static int x_beg_hist(int c) { x_load_hist(history); return KSTD;}
static int x_end_hist(int c) { x_load_hist(histptr); return KSTD;}
static int x_prev_com(int c) { x_load_hist(x_histp - x_arg); return KSTD;}
static int x_next_com(int c) { x_load_hist(x_histp + x_arg); return KSTD;}
/* Goto a particular history number obtained from argument.
* If no argument is given history 1 is probably not what you
* want so we'll simply go to the oldest one.
*/
static int
x_goto_hist(int c)
{
if (x_arg_defaulted)
x_load_hist(history);
else
x_load_hist(histptr + x_arg - source->line);
return KSTD;
}
static void
x_load_hist(char **hp)
{
int oldsize;
if (hp < history || hp > histptr) {
x_e_putc(BEL);
return;
}
x_histp = hp;
oldsize = x_size_str(xbuf);
strlcpy(xbuf, *hp, xend - xbuf);
xbp = xbuf;
xep = xcp = xbuf + strlen(xbuf);
xlp_valid = false;
if (xep <= x_lastcp())
x_redraw(oldsize);
x_goto(xep);
}
static int
x_nl_next_com(int c)
{
x_nextcmd = source->line - (histptr - x_histp) + 1;
return (x_newline(c));
}
static int
x_eot_del(int c)
{
if (xep == xbuf && x_arg_defaulted)
return (x_end_of_text(c));
else
return (x_del_char(c));
}
static kb_func
kb_find_hist_func(char c)
{
struct kb_entry *k;
char line[LINE + 1];
line[0] = c;
line[1] = '\0';
TAILQ_FOREACH(k, &kblist, entry)
if (!strcmp(k->seq, line))
return (k->ftab->xf_func);
return (x_insert);
}
/* reverse incremental history search */
static int
x_search_hist(int c)
{
int offset = -1; /* offset of match in xbuf, else -1 */
char pat [256+1]; /* pattern buffer */
char *p = pat;
int (*f)(int);
*p = '\0';
while (1) {
if (offset < 0) {
x_e_puts("\nI-search: ");
x_e_puts(pat);
}
x_flush();
if ((c = x_e_getc()) < 0)
return KSTD;
f = kb_find_hist_func(c);
if (c == CTRL('[') || c == CTRL('@')) {
x_e_ungetc(c);
break;
} else if (f == x_search_hist)
offset = x_search(pat, 0, offset);
else if (f == x_del_back) {
if (p == pat) {
offset = -1;
break;
}
if (p > pat)
*--p = '\0';
if (p == pat)
offset = -1;
else
offset = x_search(pat, 1, offset);
continue;
} else if (f == x_insert) {
/* add char to pattern */
/* overflow check... */
if (p >= &pat[sizeof(pat) - 1]) {
x_e_putc(BEL);
continue;
}
*p++ = c, *p = '\0';
if (offset >= 0) {
/* already have partial match */
offset = x_match(xbuf, pat);
if (offset >= 0) {
x_goto(xbuf + offset + (p - pat) -
(*pat == '^'));
continue;
}
}
offset = x_search(pat, 0, offset);
} else { /* other command */
x_e_ungetc(c);
break;
}
}
if (offset < 0)
x_redraw(-1);
return KSTD;
}
/* search backward from current line */
static int
x_search(char *pat, int sameline, int offset)
{
char **hp;
int i;
for (hp = x_histp - (sameline ? 0 : 1) ; hp >= history; --hp) {
i = x_match(*hp, pat);
if (i >= 0) {
if (offset < 0)
x_e_putc('\n');
x_load_hist(hp);
x_goto(xbuf + i + strlen(pat) - (*pat == '^'));
return i;
}
}
x_e_putc(BEL);
x_histp = histptr;
return -1;
}
/* return position of first match of pattern in string, else -1 */
static int
x_match(char *str, char *pat)
{
if (*pat == '^') {
return (strncmp(str, pat+1, strlen(pat+1)) == 0) ? 0 : -1;
} else {
char *q = strstr(str, pat);
return (q == NULL) ? -1 : q - str;
}
}
static int
x_del_line(int c)
{
int i, j;
*xep = 0;
i = xep - xbuf;
j = x_size_str(xbuf);
xcp = xbuf;
x_push(i);
xlp = xbp = xep = xbuf;
xlp_valid = true;
*xcp = 0;
xmp = NULL;
x_redraw(j);
return KSTD;
}
static int
x_mv_end(int c)
{
x_goto(xep);
return KSTD;
}
static int